Originally Posted by
yaychemistry
In that case you're probably better off booking them under the ME flight number and not the TK numbers. It may be possible to book them as TK - but then crediting them to DL may be difficult or impossible.
I'm not sure the reason but even if TK flights are booked using the ME flight numbers you will receive 0 miles on DL. It would need to be operated by a SkyTeam airline to receive any credit.